Also known under the pseudonym Katie Finn, she is a New York Times bestselling novelist known for Since You've Been Gone, Second Chance Summer, and the Top 8 series. She has published several successful young adult novels since her debut novel in 2008.
She studied theatre and English at Occidental College in Los Angeles. Her experience there would later inspire her book Amy and Roger's Epic Detour.
Her 2012 novel Second Chance Summer garnered the California Book Award.
Born in New York City, she was raised in both New York City and Greenwich, Connecticut. She later became based in Los Angeles, California with her terrier named Murphy. Her brother, Jason, is a lawyer.
She met fellow author Jenny Han while she was attending The New School to receive her M.F.A. in Writing for Children.